Gas detector



FIG. 1 is a front perspective view of a gas detector showing my new design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a side elevational view thereof, the opposite side being a mirror image of that shown; and,

FIG. 5 is an elevational view thereof, as seen from the right of FIG. 4, the opposite side being a mirror image of that shown. 

The ornamental design for a gas detector, as shown and described. 